harris



(NoMvodel.) T C. HARRIS. SEWING MACHINE.

N0.A410,277. Patented Spia.` 3, 1889.V

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l [UNITED STATES PATENT OFFICE.

THOMAS-O. HARRIS, OF TROY, NEYV YORK, ASSIGNOR TO T. O. HARRIS da CO.,

OF SAME PLACE. I

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 410,277, dated September 3, 1889.

i Application mea apartar 27, 1887. serial No. 250,835. camada.)

To all-whom it may concern:

Be it known that I, THOMAS C. HARRIS, of

Troy, in the county of Rensselaer and State My invention relates to those machines in which a rotating or oscillating looping-hook or shuttle is used in connectionwith a bobbin and a needle, and in which a brush is used to retard the escape of the needle-thread loop from the hook. These machines are subject to two objections which it is the aim of my invention to overcome-insu the excessive wear and friction upon the bobbin due to its being sustained at the periphery, and, second, the difficulty of so adjusting the brush in relation to the hook that it will be certain'to arrest the thread without detaining it too long.

My invention consists, essentially, in combining with the rotary looping-hook -a stationary bobbin-support and an intermediate bobbin, a central reciprocating spindle adapted to enter the bobbin and serve as its sole support, and suitable mechanism to thrust the spindle into and withdraw it from the bobbin during each rotation of the hook.

I prefer to attach the shuttle-supporting spindle to a slide actuated by a cam on the shaft which carries the looping-hook, and I have represented this arrangement in the drawings; but these details may be modified within the range of mechanical skill, the only requirement being that the bobbin-sustaining spindle should be thrust into and withdrawn from the spindle during the formation of every stitch.

I am aware that rotary-shuttle drivers have been provided on opposite sides of the center with two reciprocating pins which engage the shuttle alternately to impart a rotary motion thereto; and I am also aware that a bobbin seated in and peripherally supported bya rotary hook has 'been kept in place by a central pressure-screw bearing against its outer face, and to such constructions I lay no claim, my invention having reference solely to the combinationy of the bobbin with the mechanicallyoperated spindle, which is adapted to serve as the central and sole support therefor.

and then retracted at the proper time to permit the escape of the needle-thread.

I am aware that brushes have been supp ported by screws and other adjusting devices which admitted of their being moved to and from the hook. My invention in this regard is confined to a combination in which the brush is located at the lower part of the bobbin to retain the needle-thread loop, and combined with suitable mechanism tocause its advance and retreat during the formation of each and every stitch.

In the accompanying drawings, Figure 1 is a perspective view of the looping-hook and adjacent parts of a sewing-machine provided with my improvements, the cloth-plate, the needle, and other customary parts being removed to expose other parts to view. Fig. 2 is a top plan view o f the same. Fig. 3 is a vertical axial section through the hook, bobbin, and adjacent parts. Fig. 4. is aperspective view of the brush and its supporting devices. Fig. 5 is an end elevation of the brushoperating devices.

Referring to the drawings, A represents the bed or frame, B the rotary looping-hook, C

the stationary annular bobbin-support, D the lenticular bobbin mounted between the hook and the stationary support, and E `the cam which is carried, together with the looping-V hook, by the main shaft F.

The foregoing parts, together with the feed and needle mechanisms, are all of ordinary construction and familiar to those skilled in 9o the art.

M represents my bobbin-sustaining spindle, located at the outer sideof the bobbin and rigidly attached to an arm L on a bar G, which latter is arranged to slide horizontally in guides or bearings in the frame parallel with the main shaft.

The spindle is so formed and located that vas the bar or slide G moves to and fro the end of the spindle is first carried centrally into the bobbin and then withdrawn entirely therefrom to permit the passage of `the needle- IOO thread thereover. On entering the bobbi-n the spindle lifts the same slightly until its lower edge is out of contact with the hook and with the support C. Being thus supported wholly by the spindle, the bobbin may turn easily and without appreciable wear or friction at the periphery. The slide is drawn endwise to thrust the spindle into the bobbin by a spring H, attached at one end to the slide G and at the other end to the frame. A reverse movement of the slide is caused by the feed-cam E acting against an arm or roller on the slide, as shown.

With the exception of the `spindle and its operating device, the machine is practically the same as those now in general use, the bobbin being held against lateral motion by the hook on the one side and the support C on the other. During the moment that the spindle iswithdrawn the shuttle is sustained by a bearing at the lower edge between the hook and the stationary support, as usual. The parts are so timed that t-he spindle. is with` drawn at the instant when the needle-thread loop is required to pass over the center of the bobbin.

Passing to the second part of my invention, O represents the loop-detainng brush located below the looping-hook in position to act against its periphery-in the usual manner. It is seated in a bloclY, xed to the .end of an arm P, which is in turn secured to a'rock-shaft R, mounted in suitable bearings in the frame or bed parallel with the main shaft. This rock-shaft is provided with a second arm S, the end of which, with 0r without a rollerT therein, bears against a cam U on-theY main shaft F; YA spring V, acting beneath the arm S, serves, through'the intermediate parts, to hold the brush in opcrative position against the hook. Atthe proper time, when the needle-thread loop is to continue its course over the bobbin, the cam U rocks the shaft and throws the brush away from the hook, to which it is again returned in time to engage the next loop. The essence of my invention in this regard lies in having thc brush thrown positively to and fromthe edge of the hook. chanic will perceive that the intermediate connections for removing the brush are not of the essence of the invention, but may bevariously modied.

I am aware that two stationary spindles arranged end torend on opposite sides of the point at which the needle descends have been combined with a spool and mechanism for thrusting the saine endwise through a needlethread loop from one spindle to the other; and I am also aware that a bobbin composed of two parts united by a central pivot has been combined with an outside sustaining- A Vskilled me-V arm bywhich one of the parts is held against rotation; and to such structures I lay no claim, my invention having reference only to machinesY in which the bobbin remains at all timesin substantially the same position, and in which the supporting-spindle is thrust directly into and withdrawn from the bobbin at each rotation of the hook.

I am also aware that an automatically-reciprocating brush has been used in connection with a thread-carrying needle to open the loop that a looping-hook may enter the same.

I am further aware that a rotating looping-hook has been combinedrrwith a brush acting at its point adjacent to the needle to insure the entrance of the point of the hook into the loop of the needle-thread; and to these devices I make no claim, their object and effect being to insure the engagement of the hook with the needle-thread, while my .brush mechanism is to act at a different time in a different relation to the hook and with a different effect.

Having thus described my invention, what I claim is l. In a sewing-machine, the rotary looping-hook, the stationary bobbi11-support,and the intermediate bobbin, as usual, in combination with the central reciprocating spindle adapted to enter the bobbin and serve as its sole support, and suitable operating mechanism, substantially as shown, acting to thrust the spindle into and withdraw it from the bobbin during each rotation of the hook.

2. In a sewing-machine, the rotary looping-hoolgthe bobbin, and the stationarybobbin-support, in combination with a spindle to enter the bobbin, its sustaining-slide, and the cam and spring to actuate the slide at each rotation of the hook. f

3. In combination with the looping-hook, its shaft, and the cam thereon, the rock-shaft, the brush carried at one end of said'shaft, the cam-actuating arm at the other Yend of said shaft, and the spring.

4. In a sewing-machine, the rotary looping-hook, the needle and the peripherallyacting brush at the lower part ofthe hooi; to retain the needle-thread loop, as usual, and the freely-movable brush-support, in combination with mechanism, substantially as described, for moving said brush to and from the hook at each rotation of the latter.

In testimony whereof I hereunto set my hand, this 23d day of August, 1887, in the presence of two attest-ing witnesses.

THOMAS C. HARRIS.

Witnesses:

HERBERT D. BAILEY, R. H. THURMAN IOO IIO 

